Love your fellow as yourself (19:18)
The three loves–love of G-d, love of Torah and love of one’s fellow–are one. One cannot differentiate between them, for they are of a single essence. And since they are of a single essence, each one embodies all three.
So if you see a person who has a love of G-d but lacks a love of Torah and a love of his fellow, you must tell him that his love of G-d is incomplete. And if you see a person who has only a love for his fellow, you must strive to bring him to a love of Torah and a love of G-d–that his love toward his fellows should not only be expressed in providing bread for the hungry and water for the thirsty, but also to bring them close to Torah and to G-d.
When we will have the three loves together, we will achieve the Redemption. For just as this last Exile was caused by a lack of brotherly love, so shall the final and immediate Redemption be achieved by love for one’s fellow.
(From the words spoken by the Lubavitcher Rebbe immediately following his formal acceptance of the leadership of Chabad-Lubavitch in 1951)